DS18 EXL-X15.4D Extremely Loud 15-Inch 2500 Watts Competition Subwoofer with Dual 4-Ohms Voice Coil 2500 watts Max power and 1250 watts RMS power Red color aluminum basket with large foam edge and paper with glass fiber cone 210 oz high-strength double ferrite magnet, 2-layer conex spider, and 2.5" Black aluminum 4-layer voice coil Impedance: dvc 4+4-ohms. Sensitivity: 92Db. Frequency response: 25-1.5Khz Baffle cutout diameter: 355mm (13.98 inches). mounting depth: 205mm (8.07 inches).